DECATHLON QUECHUA (Keshua) Camping, Mountaineering, Hiking Mattress ARPENAZ COMFORT Self-Inflating 1 Person - 65CM I purchased this at a Decathlon store overseas in 2022, but ended up never using it and kept it stored in my closet. There are wrinkles on the thin paper inside the storage bag that shows the usage instructions. It was opened once at the time of purchase, and I opened it again for this listing. I only tested it to the point where it inflates on its own. (I did not test it further to add more air.) It is priced at 11,900 yen on the Decathlon website and the official Rakuten store. It would be easier to understand the product details by looking at those listings. 65cm x 190cm x 4.5cm When stored: approx. 21cm diameter, 36cm height Mattress, Air Mattress